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首页> 外文期刊>Physical review >Investigation of magnetic order in SmTr_2Zn_(20)(Tr = Fe, Co, Ru) and SmTr_2Cd_(20)(Tr = Ni, Pd)
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Investigation of magnetic order in SmTr_2Zn_(20)(Tr = Fe, Co, Ru) and SmTr_2Cd_(20)(Tr = Ni, Pd)

机译:SmTr_2Zn_(20)(Tr = Fe,Co,Ru)和SmTr_2Cd_(20)(Tr = Ni,Pd)中的磁序研究

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摘要

Single crystals of the "cage compounds" SmTr_2Zn_(20)(Tr = Fe, Co, Ru) and SmTr_2Cd_(20)(Tr = Ni, Pd) have been investigated by means of electrical resistivity, magnetization, and specific-heat measurements. The compounds SmFe_2Zn_(20), SmRu_2Zn_(20), and SmNi_2Cd_(20) exhibit ferromagnetic order with Curie temperatures of T_c = 47.4, 7.6, and 7.5 K, respectively, whereas SmPd_2Cd_(20) is an antiferromagnet with a Neel temperature of T_N = 3.4 K. No evidence for magnetic order is observed in SmCo_2Zn_(20) down to 110 mK. The Sommerfeld coefficients γ are found to be 57 mJ/mol K~2 for SmFe_2Zn_(20), 79.5 mJ/mol K~2 for SmCo_2Zn_(20), 258 mJ/mol K~2 for SmRu_2Zn_(20), 165 mJ/mol K~2 for SmNi_2Cd_(20), and 208 mJ/mol K~2 for SmPd_2Cd_(20). Enhanced values of γ and a quadratic temperature dependence of the electrical resistivity at low temperature for SmRu_2Zn_(20) and SmPd_2Cd_(20) suggest an enhancement of the quasiparticle masses due to hybridization between localized 4f and conduction electron states.
机译:已经通过电阻率,磁化强度和比热测量方法研究了“笼型化合物” SmTr_2Zn_(20)(Tr = Fe,Co,Ru)和SmTr_2Cd_(20)(Tr = Ni,Pd)的单晶。化合物SmFe_2Zn_(20),SmRu_2Zn_(20)和SmNi_2Cd_(20)表现出铁磁有序,居里温度分别为T_c = 47.4、7.6和7.5 K,而SmPd_2Cd_(20)是反铁磁体,尼尔温度为T_N。 = 3.4K。在低至110 mK的SmCo_2Zn_(20)中未观察到磁序的证据。发现SmFe_2Zn_(20)的Sommerfeld系数γ为57 mJ / mol K〜2,SmCo_2Zn_(20)的Sommerfeld系数为79.5 mJ / mol K〜2,SmRu_2Zn_(20)的258 mJ / mol K〜2,165 mJ /对于SmNi_2Cd_(20)为mol K〜2,对于SmPd_2Cd_(20)为208 mJ / mol K〜2。对于SmRu_2Zn_(20)和SmPd_2Cd_(20),γ的增强值和低温下电阻率的二次温度依赖性表明,由于局部4f与导电电子态之间的杂化,使得准粒子质量增强。

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  • 来源
    《Physical review》 |2014年第14期|144406.1-144406.10|共10页
  • 作者单位

    Department of Physics, University of California, San Diego, La Jolla, California 92093, USA,Center for Advanced Nanoscience, University of California, San Diego, La Jolla, California 92093, USA;

    Department of Physics, University of California, San Diego, La Jolla, California 92093, USA,Center for Advanced Nanoscience, University of California, San Diego, La Jolla, California 92093, USA;

    Department of Physics, California State University Fresno, Fresno, California 93740, USA;

    Department of Physics, University of California, San Diego, La Jolla, California 92093, USA,Center for Advanced Nanoscience, University of California, San Diego, La Jolla, California 92093, USA;

    Department of Physics, University of California, San Diego, La Jolla, California 92093, USA,Center for Advanced Nanoscience, University of California, San Diego, La Jolla, California 92093, USA,Materials Science and Engineering Program, University of California, San Diego, La Jolla, California 92093, USA;

    Department of Physics, University of California, San Diego, La Jolla, California 92093, USA,Center for Advanced Nanoscience, University of California, San Diego, La Jolla, California 92093, USA;

    Department of Physics, University of California, San Diego, La Jolla, California 92093, USA,Center for Advanced Nanoscience, University of California, San Diego, La Jolla, California 92093, USA;

    Department of Physics, University of California, San Diego, La Jolla, California 92093, USA,Center for Advanced Nanoscience, University of California, San Diego, La Jolla, California 92093, USA;

    Quantum Design, 6325 Lusk Boulevard, San Diego, California 92121, USA;

    Department of Physics, University of California, San Diego, La Jolla, California 92093, USA,Center for Advanced Nanoscience, University of California, San Diego, La Jolla, California 92093, USA,Materials Science and Engineering Program, University of California, San Diego, La Jolla, California 92093, USA;

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  • 正文语种 eng
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  • 关键词

    strongly correlated electron systems; heavy fermions; electrical and thermal conduction in crystalline metals and alloys; valence fluctuation, kondo lattice, and heavy-fermion phenomena; other ferromagnetic metals and alloys;

    机译:强相关电子系统;重费米子晶体金属和合金中的导电和导热;价态波动;近藤晶格和重费米子现象;其他铁磁金属和合金;

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